It was narrated from Abu Ghawth bin Husain – a man from Furu’ – that he consulted the Prophet ﷺ about a Hajj that his father owed, but he had died and had not gone for Hajj. The Prophet ﷺ said:
“Perform Hajj on behalf of your father.” And the Prophet ﷺ said: “The same applies to fasting in fulfillment of a vow – it should be made up for.”

حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، حَدَّثَنَا عُثْمَانُ بْنُ عَطَاءٍ، عَنْ أَبِيهِ، عَنْ أَبِي الْغَوْثِ بْنِ حُصَيْنٍ، - رَجُلٌ مِنَ الْفُرْعِ - أَنَّهُ اسْتَفْتَى النَّبِيَّ ـ ﷺ ـ عَنْ حِجَّةٍ كَانَتْ عَلَى أَبِيهِ مَاتَ وَلَمْ يَحُجَّ قَالَ النَّبِيُّ ـ ﷺ ـ " حُجَّ عَنْ أَبِيكَ " . وَقَالَ النَّبِيُّ ـ ﷺ ـ " وَكَذَلِكَ الصِّيَامُ فِي النَّذْرِ يُقْضَى عَنْهُ " .